It's difficult to make iterative developments when there's two
nearly-identical types that need to be kept synchronized to any change.
Rust gives us traits so we should use them instead of duplicating code.
This made it easier to make styling and layout improvements to both
instances of the segmented button.
- Removes the orientation enum in favor of two separate widgets
- Implements the spacing attribute for both widgets
- Demo is updated to display spaced variants of the widgets
- Updated example to show behavior
- Created styles for Expander and ExpanderRow
- Simpler implementation of `ExpanderRow`
- Deleted `ExpanderData` and replaced it with `ExpanderRow`
- Every row can now have child rows.
- Ran cargo fmt.
- Deleted settings example
- Added expander to cosmic example
- Expander icons now render
ListBox partially implemented
- Created new widget `scrollbar` which can adopt COSMIC styling.
- Increased sidebar icon size by 4 pixels to improve visibility.
- Added padding inside the navigation bar to prevent collision with the scrollbar.
- Increased the max width of the condensed navbar for the scrollbar.
